errors please if you could help me

After doing basic things, like adding a post, I get this error…

WordPress database error: [Table ‘girlfriend_wordpress.wp_post2cat’ doesn’t exist]
SELECT cat_ID AS ID, MAX(post_modified) AS last_mod FROM wp_posts p LEFT JOIN wp_post2cat pc ON p.ID = pc.post_id LEFT JOIN wp_categories c ON pc.category_id = c.cat_ID WHERE post_status = ‘publish’ GROUP BY cat_ID

WordPress database error: [Table ‘girlfriend_wordpress.wp_post2cat’ doesn’t exist]
SELECT cat_ID AS ID, MAX(post_modified) AS last_mod FROM wp_posts p LEFT JOIN wp_post2cat pc ON p.ID = pc.post_id LEFT JOIN wp_categories c ON pc.category_id = c.cat_ID WHERE post_status = ‘publish’ GROUP BY cat_ID

yet when i go to look, it published fine…. This is happening in other places too, yet appears to be the same errors.

Im afraid if I keep getting these errors after common tasks, its going to mess something up…

yet, it publishes fine…. anyone have any idea what is causing this, and how to fix.

My url is http://www.girlfriendslingerie.com/lingerie/